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प्रश्न
ZZ/ZW type of sex determination is seen in ______.
पर्याय
Peacock
Cockroach
Platypus
Snails
apple snail
human
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उत्तर
ZZ/ZW type of sex determination is seen in peacock.
Explanation:
The ZZ/ZW type of sex determination is seen in birds, many fishes, and reptiles. In this system, the female is heterogametic (ZW), meaning she produces two types of eggs,one with the Z chromosome and one with the W chromosome. The male is homogametic (ZZ), producing only one type of sperm with the Z chromosome.
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संबंधित प्रश्न
Answer the following questions related to sex determination in human beings:
i. What is sex chromosome?
ii. How many pairs of chromosomes are present in human beings?
iii. How is the sex of the human offspring determined?
iv. Draw a diagram depicting sex determination in man.
If X chromosome is inherited from mother and Y from father, the offspring will be male.
Explain the mechanism of sex determination in birds.
Name the species used in sericulture. Name the stages in the life cycle of a silk moth in cyclic form.
The human animal which has an XY pair of chromosomes is called :
(a) male
(b) hybrid
(c) female
(d) doomed
The number of pair(s) of sex chromosomes in the zygote of humans is :
(a) one
(b) two
(c) three
(d) four
In human males all the chromosomes are paired perfectly except one. This/these unpaired chromosomes is/are :
(i) large chromosome
(ii) small chromosome
(iii) Y chromosome
(iv) X chromosome
Which combination of genes in the zygote will produce children with brown eyes?
The person A has only B chromosomes in all its gametes. On the other hand, another person C has chromosome D in half of gametes and chromosome E in the other half of gametes. When chromosomes B and D combine during fertilisation, a female zygote results. On the other hand, combination of B and E chromosomes produces a male zygote.
(a) What are chromosomes (i) B (ii) D, and (iii) E?
(b) Out of B, D and E, which two chromosomes are of the same type?
(c) Which chromosome is smaller in size?
(d) What is the general name of chromosomes such as B and E?
(e) Out of the two persons A and C, which one is (i) male, and (ii) female?
A family consists of two parents and their five children and the pedigree chart below shows the inheritance of the trait colour blindness in them.
Who is colour blind in the parents – the Father or the Mother?
Define the following:
Sex chromosomes
Define the following:
Sex-linked characters
Explain the following terms:
Identical twins
Choose the correct answer :
Human sex chromosomes are __________
Give Reason:
Why X-linked recessive diseases are more common among males than females.
Give Technical Term:
The cell which determines the sex of a baby.
Complete the following sentence with appropriate word:
______are the alternative forms of a gene producing different effects.
Explain the mechanism of sex determination in birds.
ZW-ZZ system of sex determination occurs in
Brief about female heterogamety.
How many ovum are formed when a diploid cell undergoes meiosis, during oogenesis?
Number of autosomes present in liver cells of a human female is ______.
In human males all the chromosomes are paired perfectly except one. This/these unpaired chromosomes is/are ______.
- large chromosome
- small chromosome
- Y-chromosome
- X-chromosome
The number of pairs of sex chromosomes in the zygote of a human being is ______
Which of the following decides the sex of the child?
The maleness of a child is determined by ______
The two versions of a trait (character) which are brought in by the male and female gametes are situated on
The chromosomal constitution of a human female can be written as ______
In humans, males are heterogametic and females are homogametic. Explain. Are there any examples where males are homogametic and females heterogametic?
